Perhaps they could create a cool hit scan weapon effect. Like a spell that causes the bullets from a mini gun or a scattergun to twirl in the air or other effects. (Cyclonic Bullets, Wavy Bullets, Sparkly Bullets, etc) But the hit scan would still be act as the straight hit scan bullets. they just do weird effects in the air together. (Bullet Effect: Cyclones, Bullet Effect: '72, Bullet Effect: Flow, Bullet Effect: Heartbeat)
Or maybe a halloween/full moon restricted unusual spell. (Spell:Halloween Magic)
Hmm, oh, oh, what about a spell on cosmetics that turns your character into the cursed voodoo version of yourself. That way you don't have the cursed voodoo soul taking up a cosmetic space.
Last Idea, a Spell where kill streaks start doing weird things to the weapon, (Changing color, unique unusual effect, any halloween spell before etc.) (Spell: Halloween Killstreaker)